patch 9.0.1546: some commands for opening a file don't use 'switchbuf'

Problem:    Some commands for opening a file don't use 'switchbuf'.
Solution:   Use 'switchbuf' for more commands. (Yegappan Lakshmanan,
            closes #12383, closes #12381)
diff --git a/src/version.c b/src/version.c
index f13f8e0..a873172 100644
--- a/src/version.c
+++ b/src/version.c
@@ -696,6 +696,8 @@
 static int included_patches[] =
 {   /* Add new patch number below this line */
 /**/
+    1546,
+/**/
     1545,
 /**/
     1544,